The Health Officer is empowered to make unannounced inspections of the interior and exterior of business buildings to determine full compliance with this article, and the Health Officer shall make periodic inspections at intervals of not more than forty-five days of all rat proofed buildings to determine evidence of rat infestation and the existence of new breaks or leaks in their rat proofing and when any evidence is found indicating the presence of rats or openings through which rats may again enter the business buildings, the Health Officer shall serve the owners of occupants with notice or orders to abate the conditions found. (1967 Code Sec. 16-10)